V2 feature/add queue manager

[liguangbo]

close #115

[git-hulk]

overall was LGTM, except I'm not sure the name of MetaManager was suitable while it's too generic and not easy to fast identify what meta indeed. maybe a name like QueueManager was better than that, how do you think.

[git-hulk]

It seems notify would be more precious than publish since its duty was to notify the lmstfy server to pull the new configuration.

[liguangbo]

fix

[codecov]

Codecov Report

Merging #116 (eb100cd) into v2 (5d3af6d) will increase coverage by 0.63%.
The diff coverage is 63.91%.

@@            Coverage Diff             @@
##               v2     #116      +/-   ##
==========================================
+ Coverage   51.02%   51.66%   +0.63%     
==========================================
  Files          24       26       +2     
  Lines        1858     1955      +97     
==========================================
+ Hits          948     1010      +62     
- Misses        777      797      +20     
- Partials      133      148      +15     

Flag	Coverage Δ
unittests	51.66% <63.91%> (+0.63%)	⬆️

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Impacted Files	Coverage Δ
engine/redis-v2/utils.go	50.00% <50.00%> (ø)
engine/redis-v2/queue_manager.go	64.21% <64.21%> (ø)

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[liguangbo]

overall was LGTM, except I'm not sure the name of MetaManager was suitable while it's too generic and not easy to fast identify what meta indeed. maybe a name like QueueManager was better than that, how do you think.

refactor to QueueManager, but feel something strange. @chensunny what do you think?

[git-hulk]

overall was LGTM, except I'm not sure the name of MetaManager was suitable while it's too generic and not easy to fast identify what meta indeed. maybe a name like QueueManager was better than that, how do you think.

refactor to QueueManager, but feel something strange. @chensunny what do you think?

ahh... It's hard to get a right name